Surge continous this water supply system operation practice shows that the river 3 0 to achieve the closed loop control of pressure pipeline system, meet the pressure of water supply pipe network mangosteen intelligent motor controller in water supply system has a good application prospect 1 Xu Feng, Liu Yuxiu. Rockwell 8 2 intelligent motor controller. Low voltage 2 Zhou Shaoying, Niu Xiuyan. Motor and drag. Beijing Central Broadcasting University, Shanghai 3, Shanghai Municipal Economic and Trade Commission, the office of the office of energy conservation, the office of electrical and mechanical industry, etc.. Fan water pump speed saving manual. Beijing: Mechanical Industry Press, 19875, 6 pump overhaul methods commonly used in agricultural production and rural life, the pump is commonly used agricultural farmers, but improper use, often damaged parts can't be thrown at the simple maintenance of pumps of 8 kinds of method is introduced to the friends of farmers 1 such as pumps and piping have residual water, should be all the venting.